Stone grinding and polishing machine.



G. R. MURRAY.

STONE GRINDING AND POLISHING MACHINE.

APPLICATION FILED MAR. I. I9I5. 1,230,759 12mm June 19, 1w

5 SHEETS-SHEET 1 29 ,4 TTORIVEICY G. R- MURRAY. STONE GRINDING AND POLISHI G MACHINE. v APPLICATIQN FILED MAR-1| 1915- v 7 1,230,759. 7 Patented June 19, 1917.

5 SHEETS-SHEET 2.

Fig.2-

WITNESSES:

v Mil EN TOR 3/ MU I. w

wyaw. Br

A TTOR/VEV I G. R. MURRAY.

STONE GRINDING AND POLISHING MACHINE.

APPLICATION men MAR} i. 1915. 1 230,759. Patented June 19, 1917 v 5 SHEETS-SHEET 3.

w mm

9 Him WITNESSES,- I lJVl/E/V TOR 4 Mammy ATTORNEYS e. R. MURRAY.

STONE GRINDING AND POLISHING MACHINE.

APPLICATION FILED MAR. 1. i915.

Patentgd June 19, 1917.

5 SHEETS-SHEET 4.

Fig. 4

4 A TTOR/VEVJ G. MURRAY. I

STONE GRINDING AND POLISHING MACHINE.

APPLICATION FILED MAR. I. I915.

Patented June 19, 1917.

5 SHEETS-SHEET 5.

INVENTOR 65x45 7?. 1.7mm)

5y 14 M" MOB/I15?! WITNESSES" GEORGE E. MURRAY, 0F CLEVELAND, OHIO.

STONE GRINDING AND POLISHING MACHINE.

' Specification of Letters Patent.

Application filed March 1, 19%. Serial No. 11,142.

To all whom it may concern:

Be it known that GEORGE R. MURRAY, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, has 'invented certain new and useful Improvements in Stone Grinding and Polishing Machines, of which the following is a specification.

This invention pertains to a stone grinding and polishing machine, and the invention consists in an improvement in or upon the machine shown in my application for Letters Patent of the United States, filed August 3, 1912, Ser. No. 713,218.

In the accompanying drawings, Figure 1 is a plan view of the machine with the table partly broken away at the bottom to show the endless track beneath. Fig. 2 is a cross section, enlarged, on a line substantiallycentral of Fig. 1, right to left. Fig. 3 is a sectional view on line 33, Fig. 2 and Fig. 4 is a sectional elevation corresponding in part to Fig. 3 but on the axis of one of the grinders and showing the grinder and its shaft and water supply connection and associated parts. Fig. 5 1s a plan view of one of the grinders as seen in Fig. 4: 'with wedges to secure the grinding members, and Fig. 6 is a plan view of a grinder showing clamps to secure the said members, and Fig. 7 is a side elevation of the machine. Fig. 8 is a clamp detail.

All the foregoingviews are necessarily on a greatly reduced scale as the machine is of very large proportions, say 25 to 50 feetacross thestone carrying table, T, and some of the stones S thereon may be six to eight feet in length and the elevations of some of the parts correspond to these proportions, the rule of proportions being observed as nearly as possible.

The stone carrying table T is of ring shape rather than a disk and adapted to be rotated on a circular track 2 beneath, hav ing wheels or rollers for this purpose. A ring gear 3 is rovided at the inner edge of the table whlch is engaged by power or driving means through the shaft s'and gear 4. A comparatively slow movement or retation of the said table is found sufficient and this movement is operatively associated with a reciprocating action of the grinders G across the face of the stones S on exposed portion of the table. It will be seen that the stones are placed flatwise upon the table in position to becarried around sucthe cess vely beneath the grinders and to be sub eCted to the grinding action in proportion to their own rate of travel and the speed of the grinders, so that they may pass or rims 7 at its edges-of at least such depth as Wlll submerge the stone. Rim 7 ma be made high enough or is supplemente by a ring or band 1" to provide an effective guard for flying pieces of stone and flying spray. I The water is supplied to the table through the tubular shafts 5 of the respective grinders by pipe 6 and flexible hose connection it to accommodate the travel. A rigid traveling frame F has iateral projections f at its side edges which in a sense serve as bearings for said shafts'5, and the said shafts and grinders are vertically adjustable in said hearings or' guides within limits by means of air adjusting screw 8 and an arm 9 threaded for the passa e-of said shaft and having a guide head 9 s dahle on frame F. The said screw is mounted at its ends in frame F and rotated by means of bevel. pinion 10 thereon and sand rotated gear 12 in mesh therewith, or the equivalent.

Both grinders G are supported and o 1 erated in like manner, and the frame carrying said grinders and their associated parts is slidably mounted in its four angles or corners on guides or guide rods R mounted at their ends in or upon the base frame B. The said frame F and the grinders and all the parts operatively pertaining thereto are adapted to reciprocate on said rod R While the said grinders are axially rotated at the same time and the table T. is carried around beneath the same, thus making a tripple moving operation. Reciprocation is e ected by means of a suitable power medium or engine E and connecting rod or shaft l5 therewith and with the center offrame F, and rotation of said grinders is through the sheaves 16,13 and 18 and the cable 22 running thereon. Thus, the sheave 16 is slidably splined on the upper end of shaft 5 and has its bearing on the'projection 7 at that corner of frame F and the sheave 17 is mounted on a traveler 19 hav- Patented June 1%, 1917. I

ing rollers or wheels 20 running on fixed tracks or rails 21. The cable or belt 22 runs over these several sheaves or wheels and over idler 23 above, and power is applied to this line of mechanism to rotate the grinders by means of the shaft 25 which carries. sheave 18 and by belt 26, or equivalent driving connections, to a pulley 27 on said shaft. The cable 22 is drawn taut over its several carrying sheaves and the traveler 19 is held in counterbalanced working relations by the respective 'counterweights 28 and 29, and the cords 30 and 31 connect with said traveler and said Weights, respectively. Such play as the wheel 17 may need in respect to the grinders in their reciprocating travel is provided for'in the said counterweights and cords.

Reciprocation of the grinders across the face of the stones is therefore by the power medium E, while rotation thereof is through the cable or belt 22 from the power driven shaft 25 and wheel 18 thereon. Each grinder has its own driving mechanism, and

one or both can be used at the same time and both may be alike or one to do the rough work and the other the polishing, thus completing the work in a single treatment of the stones.

The said shafts 5 are rotatable and free to slide in the projections f, Fig. 4*, and each shaft has collars 30 and 31 clamped thereon above and below the arm 9 respectively. Another collar 32, is sleeved on shaft 5 next beneath collar 31' and carries ball bearings 33 for thecollar 31'. A counterbalancing lever 34 has a yoke 35 at its inner end engaged by screws 36, and said collar 32 is held in. permanently raised position as against collar 31 by the weight 37 on said lever 34." jAn arm 38 from the part 9 serves as a pivot support for the lever 34.

In operation the collar 30 serves to limit the depth of cut of the grinder upon the stone as it comes down into a position of rest on the stop member 9, and the collar 31 fixes the limit to which the grinder can be raised by impinging against the stop 9 when the grinder and its shaft is raised by the lever 34 and its counterweight 37. This weight and lever serve also to graduate the down pressure under which a grinder does its work, and the grinder can be more or less raised thereby or lifted completely above the stone, as seen in Figs. 3 and 4.

One method of securing the grinding or abrading members or block 7 is illustrated in Figs. 4 and 5 wherein wedges w and plaster of Paris are employed and whereby the said member can be lowered as it becomes worn. Another method is illustrated in Fig. 6, wherein clamps 42 take the place of the wedges and'the grinder has openings larger than the abrading blocks and a flange 41 is provided at one side of each opening thereof at any desired working level, and

the stones or slabs are submerged more or less as the requirements demand. The water is fed centrally to the grinders through the hollow shaft 5 and forciblyejected from beneath the grinding wheel by the relatively rapid rotation of the wheel and the outflow is from the center of the wheel through the radial spaces between the grinding blocks, thereby keeping a flowing body of fresh water constantly in the circular path of each grinding block and in this way overcoming heating or fluxing or injury to the surface of the stone and making a fine and smooth grinding operation possible with a minimum of wear on the grinding blocks. A single grinding wheel may be used, but two grindmg wheels G are preferable asone may be used in advance of the other for rough grinding and the follower wheel for finer finishing results. Each wheel G has a ver-- tically adjustable rim guard 45 which does red to dip not prevent the radial outflow of the Water but does prevent broken pieces of stone or the grinding blocks from flying outward to the possible injury of the observer and operator. A counterweight 49 is eonnected'to the slidable reciprocating frame F, by a cable 50, see F ig. 2, to cause a return movement of the frame after each forward movement imparted theretoflby engine E, the advantage of this arrangement bei'rg that the reverse movements at the frame'mrdthe grinders when at work, arweffected uniformly and steadily with' a minimum of vibration and jerk.

.What I claim is: 4

1. In a stone grinding machine, a'-"'sub stantially ring-shaped rotatable carrier for a slab to be ground, a grinding .wheel and a reciprocable'support therefor' adapted to traverse said table, means to rotate and means to raise and lower said wheel upon said support, and means to deliver water centrally through and beneath said wheel during rotative and reciprocable movements thereof.

2. In a stone grinding machine, a table for the stones, a supporting frame and a rotatable grinding member having a shaft vertically slidable therein, a counterweighted lever engaged with said shaft, collars on said she and a vertically-movable engaging part for said collars having a screw to posite sides thereof and provided with vertable table to carry the stones, a reciprocable tical shafts rotatably and slidably carried by said mounting, gneans -to adjustably fix the slidable limits of said shafts, means to adjustably counterbalance the grinding wheels, and separate/ ,pdwer-applying members carried b said mounting and slidably splined to sai shafts. 4. In a stone grinding machine, a rotaframe slidably mounted over said table and a" horizontally rotatable grinding member mounted thereomin combination with actuating means for said table, frame and member respectively, and a counterweight connected with the said frame to promote uniform and steady reversal movements of the said frame and grinding member during grinding operations.

5. In a'stone grinding machine, a grinding member mounted to rotate horizontally, and means to simultaneously bciprocate and rotate said member, a ri 'i ff said member and horizofit ly disposed rods on which said frame is slidably mounted, in combination with a ring-shaped carrier adapted to" rotate .the stones transversely beneath and in contact with the said grinding member.

6. A stone grinding machine, comprising a rotatable grinding member and means to reciprocate said member while under rotation, in combination with a rotatable ringshapedcarrier for the stones provided with adjustable border flanges adapted to vary the depth of water to submerge the stones the grinding operation.

rame' carrying 'fix the working position of said 7. In a stone grinding machine, a rotatable tally reciprocating frame and a grinding wheel rotatably mounted thereon having grinding blocks fixed therein; in combination with a rotatable stone carrier having a fixed axis of rotation and adapted to be traversed by said grinding wheel in rotating and reciprocating movements.

- 9.'In a stone grinding machine as described, a slidable frame and means to reciprocate the same horizontally,- a grinding member and a shaft therefor rotatably and slidably mounted in said frame, in combination with means to raise and lower said member comprising a separate adjusting screwsupported in said frame, an arm slid able on said frame and actuated by said screw and means on said shaft above and below said arm adapted to be engaged thereby and to limit the movements of said shaft vertically.

10. A stonelgrinding machine, comprising-a ring-shaped table adapted tobe rotated about a fixed axis, in combination with a grinding member and means to rotate and reciprocate said member at the same time, said means comprising a reciprocating frame having fixed snpports and means to grinding member in respect to said table.

'grinding member having a series of grind- .ing blocks fixed therein and a water inlet at In testimony whereof Iafiix'my signature 

